Is it safe to use a web-based generated address & private key for long term personal use? Who knows the site owner could just sweep it all away.
Perhaps OP should generate a non-web based personal address for better peace of mind.
You can use electrum wallet to generate address and i think those address are not registered anywhere other than your electrum software. But its always prefered to download paper wallet generator script and create address in computer which is not connected to internet if you want to securely store for longer period.